Send stderr to a file

So, if you use bash, prefer use the better exemple given in this other answer :. Now, the question is, how to retrieve exit status code? Perform implicit tee s or cat s when multiple redirections are attempted see Redirection. This may be useful for people finding this via google. Simply uncomment the example you want to try out. Of course, feel free to rename the output files. In other words, you want to pipe stdout into one filter tee bbb.

There is no standard way to pipe anything other than stdout into another command, but you can work around that by juggling file descriptors. See also How to grep standard error stream stderr? In bash and ksh and zsh , but not in other POSIX shells such as dash, you can use process substitution :.

Each operating system based on Linux has a conviction of a default place for the executed command. Your Bash or Zsh shell is constantly looking for the default output location. When the shell detects new output, it displays it on the terminal screen for you to see it. Otherwise, it will send the output to its default location. Standard error or stderr is similar to standard input and output, but it is utilized for storing error messages.

The standard error can be redirected to the command line or a file using a terminal. If you want to record or store messages in a separate log file or hide the error messages, redirecting stderr will help you. Active 2 years, 2 months ago. Viewed 1. Improve this question. Faria 6, 5 5 gold badges 23 23 silver badges 29 29 bronze badges. But any new answers should go to the more general question.

Add a comment. Active Oldest Votes. Improve this answer. So hashdeep -rXvvl -j 30 -k checksums. Faria yes. But the last two commands are equivalent, they will send both error and output to the same file. Show 7 more comments. Additionally, certain commands such as time and strace write output to stderr by default, and may or may not provide a method of redirection specific to that command Basic theory behind redirection is that a process spawned by shell assuming it is an external command and not shell built-in is created via fork and execve syscalls, and before that happens another syscall dup2 performs necessary redirects before execve happens.

Something like! Sergiy Kolodyazhnyy Sergiy Kolodyazhnyy Laurent Legrand Laurent Legrand 1, 6 6 silver badges 6 6 bronze badges. Why do you need an ampersand here? How would write to a file named 1 otherwise? The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.

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